The excerpt from the new book follows Christian Grey, the Seattle billionaire with a taste for sadomasochistic sex, as he waits in a car outside his ex-lover Anastasia's office building. "Opening my eyes, I stare at the front door through the Audi's darkened glass that now reflects my mood," the excerpt reads. "Nothing turns out as I expect with Miss Anastasia Steele. Panic knots my stomach once more."

The original three "Fifty Shades" books were told from the point of view of Anastasia "Ana" Steele, a college student who has a complicated — and kinky -- relationship with entrepreneur Christian Grey.

Last year, James released "Grey: Fifty Shades of Grey as Told by Christian," which told the story of the trilogy's first book from Christian's perspective. Despite largely negative reviews, James' fans snapped the book up — it sold more than 1 million copies in a week, and has garnered more than 13,000 Amazon customer reviews, most of them positive.

The "Fifty Shades" books quickly became a publishing phenomenon after the first novel in the series was released in 2011, selling more than 100 million copies across the world, and spawning a hit 2015 film starring Jamie Dornan and Dakota Johnson.

The "Fifty Shades Darker" movie opens in February 2017. The next book might be coming next year, too; a note at the bottom of the excerpt in her Facebook post just reads "coming 2017 (hopefully)."